Solvent system for cellulose
US4302252A · kind A · utility
34Cited by
7References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1980 |
| Grant date | Nov 24, 1981 |
| Priority date | — |
| Expiry date | Apr 30, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2301/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Cellulose is activated by penetration of the cellulose with a polar medium and mixed at a temperature at which no significant degradation occurs with an amide selected from the group consisting of dimethylacetamide, 1-methyl-2-pyrrolidinone and mixtures thereof and from 3 to 15% by weight of lithium chloride. The cellulose is then dissolved in the amide and lithium chloride in the substantial absence of any polar medium other than the amide. Shaped cellulosic products may be formed by reconstituting the cellulose in fiber, sheet or other form.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.